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    Question A model rocket...

    A model rocket is launched straight into the air and its velocity t seconds after engine ignition is decribed by v(t)=50t/a+t^2 feet per second,where 'a' is some positive number.If the rocket begins to decelerate at exactly t=2 seconds,then what is a?
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    Quote Originally Posted by mathcalculushelp View Post
    A model rocket is launched straight into the air and its velocity t seconds after engine ignition is decribed by v(t)=50t/a+t^2 feet per second,where 'a' is some positive number.If the rocket begins to decelerate at exactly t=2 seconds,then what is a?
    the acceleration, a(t) , changes sign when the rocket begins to decelerate ...

    a(2) = v'(2) = 0
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